Improvement in sewing-machines



2 Sheets-$heet 1..

GROVER & BAKER.

Sewing Machine.

' Patented Feb. 11, 1851. 1

Pllell ll I I l u. PETERS. Phda-Uhognphor. Wuhinflon. \z c.

GROVER & BAKER. 2 Sheetksh? v Sewing Machine.

Patentgd Feb. in, 1851. y

I Md MW M my I N. PETERS. Pink-lithograph. Washington. an

UNITED STATES PATENT OFFICE.

\v. o. cnovnn, or nosrox, AND WM. E. Barren, 0F ROXBURY, MASS.

IMPROVEMENT lN SEW ING MACHINES.

- Specification forming part of Letters Patent No. 7,931, dated February11,1851.

f0 all whom it may concern:

Be it known that we, W. 0. Gnovnn, of Boston, in the county of Suffolkand .Sttate of Massachusetts, and \V. l). BAKER, of Boxbury, in thecounty of Norfolk and State More said, have invented certain new anduseful Improvements in Sewing Machinery; and we do hereby declare thatthe following description, taken in connection with the accompanyingdrawings, hereinafter referred to, forms a full and exact description ofthe same, wherein we have set forth the nature and principles of oursaid improvements, by which our invention may be distinguished fromothers of asimilar class, together with such parts as we claim anddesire to have secured to us by Letters Patent.

thread, either by a rotary or a traverse move ment, and the forming of adouble-loop stitch by the peculiar movements of said two needles andtheir respective threads.

A A A A A is the frame-work of the machine, which may be constructed asshown in the drawings, or in any other suitable way, to sustain theoperative part of the apparatus. The two pieces of cloth to be joined'orseamed are placed on the platform a a a J, and fed along by thefeeding-rolls b b c and band (2 d, which are made to move intermittentlyand after each stitch, by means which will be referred to in the sequel.The thread for the two needles is wound on the spools e f, which aresupported and turn on horizontal spindles g g h h, having hearings inthe upright portion A A of the frame-work. A suitable" degree .offriction is brought to bear on these spools, so as to prevent the threadfrom unwinding too easily by the springs t k, which are operated,respect-ively, by screws Z m, in amanner well understood by mechanics.

'1; is the vertical. needle, with the eye formed at a proper distancefrom the point, as is usual in other kinds of sewing-machines, and fixedin the socket end of the needle-arm o o, as

shown in Fig. 2. Thethread which supplies this needle comes from thespool c, andis passed through a hole in the spring-guide pp and throughthe eye of the needle, in the direction shown by the blue line in Fig.2. This needle turns or vibrates on the -short shaft 'q,. Figs. 1 and 2,and is operated by means of the arm '1' r, attached to it at a properpoint, andworked up and down by means of the eccentrio or cam s on thedriving-shaft t t, which by the red lines in Fig.1, said red lines bep,ing dotted when the thread is under the plat form a. a a. The horizontalneedle derives its reciprocating motion in a proper direction from thelever-rod W W, which turns on the fulcrum 0:, one end of which rodclasps the elongated study, depending from the under side of theholder'o 1;,while the'othe'r end has'a roller. z,.fitted on it againstthe face of the cam a a on the driving-shaft, by the revoln tions ofwhich the needle 1/. is moved forward, the retractingspring b b (shownby dotted lines in'Fig. 1) operating to draw it back again. The cam a aalso actuates one end of the lever o c,which turns on the fulcrum d, andworks the pawl e',which turns the ratchet-wheelf' on the roller 0 oftheset of feeding-rolls before referred to. i

The operation of the machine is as follows: The cloth is placed, asbefore described, on the platform a a a, which has a proper hole in itfor the play of the vertical needle, which passes through the cloth andforms a loop on the under side of the cloth, and the horizontal needlepasses through this loop, forming another loop beyond, and holding thefirst loop until the vertical needle is drawn up and pressed down'again,(through the loop formed by the horizontal needle,) which draws up theloop first made and forms the double-loop stitch, as hereinabove firstsuggested, and

which is a detail View of said stitch, 810., on a and uniting two piecesof cloth or forming the which is particularly represented in Fig. =1, 1tally, substantially as hereinabove described, 5

large scale. I seam by means of the Gamble-100p stitch, as Having thusQespribed (ifllf improvpn10x1is, hcrcinabovc set forth. we shalLstateour claim as fofimvsz'; "What we 1 WVM: 0.: GROVER.

claim our invention, and dvsirc: to have XVM. 1']. BAKER. cured to us byLot'fm's Patent, 1s \K itncsses:

The use oftwonvedlos opal-atingaltonmtch', I Emu LINPOLN,

